how to get current use in firebase in ionic code example

Example: how to get current use in firebase in ionic

.controller('dashCtrl', function($scope, $state, $ionicPopup, $ionicLoading, $firebaseAuth) { //library injection

var user = firebase.auth().currentUser; // code from firebase docs
var name, email, photoUrl, uid; //declare the variable

//checking the user
if (user != null) {
  name = user.displayName; //fetch the name
  email = user.email; // fetch the email
  photoUrl = user.photoURL; // fetch
  uid = user.uid;  // fetch uid
  //password = user.password;
  // The user's ID, unique to the Firebase project. Do NOT use
  // this value to authenticate with your backend server, if
  // you have one. Use User.getToken() instead.

  console.log(email); //log the email. success display at console
  console.log(uid);
}
  //logout function
  $scope.logout=function(){
     firebase.auth().signOut().then(function() {
     console.log("Sign-out successful.");

     $state.go('login');
   }, function(error) {
      // An error happened.
  });
 }

})